21
602 DB9 Port Pin Functions
The table below explains the functions of the pins on the Axxium Pro DB9 port. This port is on the
Axxium Pro UPS back panel, as shown in Figure 5.
Table 6. DB9 Port Signals
* Contacts consist of open-collector circuits capable of switching up to +40 VDC, 50 mA resistive load.
Pin
Function
1
RS-232 Receive Data. Receives incoming RS-232 communication data. The data protocol is 9600 baud,
8 bits, no parity, 1 stop bit, no handshaking.
NOTE: In battery operation, a 5-VDC (RS-232 low) signal applied to this pin causes the UPS to shut
down after a delay of X minutes, regardless of the return of AC input power. This time is defined by
the External Shutdown Mode parameter n, where n and X are related as follows:
n
X
n
X
n
X
0
2
3
3
6
20
1*
2
4
5
2
1
5
10
* For n=1, the UPS stays off when AC input power returns. For all other values of n,
the UPS restarts 12 seconds after AC input power returns.
2
RS-232 Transmit Data. Sends outgoing RS-232 communication data. The data protocol is 9600 baud,
8 bits, no parity, 1 stop bit, no handshaking.
3
Normally-Open On-Battery Contact*. A normally open contact that closes (pulls to Common) 15 seconds
after the UPS switches to battery power.
4
Common. The ground reference for all input and output signals.
5
Normally-Open Low-Battery-Alarm Contact*. A normally open contact that closes (pulls to Common)
to signal a Near Low Battery or Low Runtime alarm.
Values that affect this contact closure may be user-programmed.
6
Reserved.
7
Immediate Shutdown Mode (set by External Shutdown parameter, n = 0):
Grounding this pin for 5 seconds causes the UPS to switch immediately to the Off mode.
When AC input power returns, the UPS will not restart without user intervention.
Remote Shutdown Mode (set by External Shutdown parameter, n = 1 or greater):
In battery operation, grounding this pin for 5 seconds causes the UPS to shut down after
a delay of X minutes, regardless of the return of AC input power. This time is defined by
the External Shutdown Mode parameter n, where n and X are related as follows:
n
X
n
X
1
2
4
5
2
1
5
10
3
3
6
20
8
Normally-Closed On-Battery Contact*. A normally closed contact that opens (releases from Common)
15 seconds after the UPS switches to battery power.
9
Normally-Open Bypass-Switch-Status Contact*. A normally open contact that closes (pulls to Common)
whenever the UPS is in internal bypass mode or is being externally bypassed and is being signalled of
the external bypass.
